Here is a vbs script I use to remove multiple versions of Quicktime. I have also used this on many other applications such as Java too. All you need is the PID's of the applications you want to put into the Array. The script runs through the Array with the associated PID's and if it matches, uninstalls the app. I push this script out with SMS and have a very good success rate with it.

Call Main
Sub Main()
On Error Resume Next

Call RemoveQuicktime
End Sub

Sub RemoveQuicktime()
On Error Resume Next
Set oShell = WScript.CreateObject("WScript.Shell")